Explain why iron and aluminium do not dissolve in conc. `HNO_(3)`

Give reasons: i) Nitrogen exists as a diatomic molecule ii) Nitrogen cannot form a pentahalide iii) Aluminium does not dissolve in conc. HNO_(3)

Aluminium is not dissolved in concentrated HNO_3 solution. Why?

Zn+ "Conc." HNO_(3) rarr

State a reason for the inactivity of iron and aluminium on reaction with fuming HNO_(3) .

What happens when aluminium is treated with conc. HNO_(3) ?

What happens when aluminium is treated with conc. HNO_(3) ?

What happens when aluminium is treated with conc. HNO_(3) ?

When Sn is treated with conc. HNO_(3)

Iron becomes passive in conc. "HNO"_(3) - Why ?